High Sensi miRNA probe H, M, R Species H, M, R exosomes mirnas are available in and out of exosomes. However exosomes are the perfect and easier way to obtain most pure exosomes except the argonauts http://openwetware.org/wiki/Brown_BIOL1220:Notebook/SynBio_in_Theory_and_Practice/Genes/Argonauts(miRNA_pathway)